Intel 87C196CA Benutzerhandbuch
8XC196L
X SUPPLEMENT
A-8
Table A-5. 87C196LA, LB Default Signal Conditions
Port
Signals
Alternate
Functions
During RESET#
Active
Upon RESET#
Inactive
(Note 6)
(Note 6)
Idle
Power-
down
P0.7:2
ACH7:2
HiZ
HiZ
HiZ
HiZ
P1.0
EPA0/T2CLK
WK0
WK0
P1.1
EPA1
WK0
WK0
P1.2
EPA2/T2DIR
WK0
WK0
P1.3
EPA3
WK0
WK0
P2.0
TXD
WK0
WK0
P2.1
RXD
WK0
WK0
P2.2
EXTINT
WK0
WK0
P2.4
RXJ1850 (LB only)
WK0
WK0
P2.6
ONCE/TXJ1850 (LB only)
MD0
MD0
P2.7
CLKOUT
CLKOUT active,
LoZ0/1
CLKOUT active,
LoZ0/1
P3.7:0
AD7:0
WK0
HiZ
P4.7:0
AD15:8
WK0
HiZ
P5.0
ALE/ADV#
WK0
WK0
P5.2
WR#/WRL#
WK0
WK0
P5.3
RD#
WK0
WK0
P6.0
EPA8/COMP0
WK0
WK0
P6.1
EPA9/COMP1
WK0
WK0
P6.4
SC0
WK0
WK0
P6.5
SD0
WK0
WK0
P6.6
SC1
WK0
WK0
P6.7
SD1
WK0
WK0
—
EA#
WK1
WK1
WK1
—
RESET#
LoZ0
MD1
MD1
MD1
—
V
PP
HiZ
HiZ
LoZ1
LoZ1
—
XTAL1
Osc input, HiZ
Osc input, HiZ
Osc input,
HiZ
Osc input,
HiZ
—
XTAL2
Osc output,
LoZ0/1
Osc output,
LoZ0/1
Osc output,
LoZ0/1
NOTES:
1.
1.
If P
x
_MODE.
y
= 0, port is as programmed.
If P
x
_MODE.
y
= 1, pin is as specified by P
x
_DIR and the associated peripheral.
2.
If P2_MODE.7 = 0, pin is as programmed. If P2_MODE.7 = 1, pin is LoZ0.
3.
If XTAL1 = 0, pin is LoZ1. If XTAL1 = 1, pin is LoZ0.
4.
If EA# = 0, port is HiZ. If EA# = 1, port is open-drain I/O.
5.
Although EA# is weakly pulled high, do not allow it to float. Always tie EA# to V
CC
if it is not connected
to an external device.
6.
The values in this column are valid until your software writes to P
x
_MODE.